Principle of salt spray corrosion test chamber

Salt mist test chamber can be done with four types: neutral salt spray test (NSS), copper accelerated acetate salt spray test (Cass), alternating salt spray test, acetate fog test ( ASS test). Of course, different tests are not only different solutions to the test, and the design and structure of the casing may also vary.

First, the temperature requirements of the neutral salt spray test (NSS) test chamber (35 plusmn; 2) ° C, the humidity is greater than 95%, the mixture is 1 to 2 mL / 80 cm * H nozzle pressure It is 78.5 to 137.3kPa (0.8 ~ 1.4 kgf / cm2). In the salt spray test chamber, brine containing (5 ± 0.5)% sodium chloride, a pH of 6.5 to 7.2 was sprayed by a spray device, so that the salt mist settled to the test inspection, after a certain period of time. Surface corrosion state.

Second, copper acceleration acetate salt spray test (Cass) is added to 5% sodium chloride salt on the basis of a general salt spray test to give concentration It was 0.26 g / L, and the pH was adjusted with acetic acid, so that the pH of the salt spray collection liquid was 3.1-3.3. (Test Reference GB / T 10125 Artificial Atmosphere Corrosion Test)

Third, the alternating salt spray test is a comprehensive salt spray test (realization of alternating salt spray test chamber.

Fourth, acetate fog test (A

SS test) is developed on the basis of neutral salt cockroaches. It is added to 5% sodium chloride solution Some glacial acetic acids.